Examine source code of OptiPress Image Injector

{
  "manifest_version": 3,
  "name": "OptiPress Image Injector",
  "version": "1.3",
  "description": "Compress and pad images to exact KB target sizes directly from any web page file input.",
  "browser_specific_settings": {
    "gecko": {
      "id": "optipress-image-injector@optipress.org",
      "strict_min_version": "109.0"
    }
  },
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "pdf-lib.min.js",
        "pdf.min.js",
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "all_frames": true
    },
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "main-world.js"
      ],
      "world": "MAIN",
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "pdf.worker.min.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}